Pulse mushrooms in a food processor until finely chopped. Transfer to a bowl, and gently stir together with beef, and Matty’s BBQ Sauce. Form into four ½-inch-thick patties and sprinkle each with salt and pepper.
Heat Lemon Garlic in a large cast iron pan over medium-high heat. Add patties and cook until browned, about 3-4 minutes per side for medium-rare. Remove from pan and let rest while preparing the “buns”.
Carefully wipe out pan and return to medium-low heat. Sprinkle the largest 8 sweet potato slices with salt and pepper and add to pan.
Cover and cook until lightly browned, about 5 minutes per side. Arrange burgers on sweet potato “buns” then top with arugula and drizzle with Creamy Ranch.